arXiv 1405.26372014-05hep-phastro-ph.CO

暗物质-核子有效相互作用的全局拟合

Global fits of the dark matter-nucleon effective interactions

Riccardo Catena, Paolo Gondolo

备注：: 32 pages, 11 figures, replaced to match the published version
发表信息：: JCAP 1409 (2014) 09, 045
DOI：: 10.1088/1475-7516/2014/09/045

摘要：

由自旋为1或0的重粒子介导的暗物质-核子相互作用的有效理论除了依赖于暗物质粒子质量外，还依赖于10个耦合常数。在这里，我们比较了这个11维有效的理论，目前的观察在一个全面的统计分析几个直接检测实验，包括最近的LUX，SuperCDMS和CDMSlite的结果。从一个多维扫描约300万似然评估，我们提取边缘化的后验概率密度函数（贝叶斯方法）和配置文件似然（频率论方法），以及相关的可信区域和置信水平，每个耦合常数与暗物质质量和每对耦合常数。我们比较贝叶斯和频率论的方法，在目前有限的数据量。我们发现，目前的直接检测数据包含足够的信息，同时约束不仅熟悉的自旋无关和自旋相关的相互作用，但也剩余的速度和动量依赖的耦合预测的暗物质-核子有效理论。对于目前的实验与零的结果，我们发现一些对之间的强相关性的耦合常数。对于声称信号的实验（即，CoGeNT和DAMA），我们发现成对的耦合常数产生简并结果。

英文摘要：

The effective theory of isoscalar dark matter-nucleon interactions mediated by heavy spin-one or spin-zero particles depends on 10 coupling constants besides the dark matter particle mass. Here we compare this 11-dimensional effective theory to current observations in a comprehensive statistical analysis of several direct detection experiments, including the recent LUX, SuperCDMS and CDMSlite results. From a multidimensional scan with about 3 million likelihood evaluations, we extract the marginalized posterior probability density functions (a Bayesian approach) and the profile likelihoods (a frequentist approach), as well as the associated credible regions and confidence levels, for each coupling constant vs dark matter mass and for each pair of coupling constants. We compare the Bayesian and frequentist approach in the light of the currently limited amount of data. We find that current direct detection data contain sufficient information to simultaneously constrain not only the familiar spin-independent and spin-dependent interactions, but also the remaining velocity and momentum dependent couplings predicted by the dark matter-nucleon effective theory. For current experiments associated with a null result, we find strong correlations between some pairs of coupling constants. For experiments that claim a signal (i.e., CoGeNT and DAMA), we find that pairs of coupling constants produce degenerate results.

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